Square numbers

A square number is any number that can be represented as a perfect square.

For example:

assume these are all perfect squares'

Since a perfect square has four equal sides, and we find the area by using the formula A = L x W, this square can represented as:

4 x 4 = 16

Therefore the number 16 is a square number.

Other square numbers include: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, etc...

Non-perfect square

A non-perfect square is a fraction or decimal that is not a perfect square.
Example: 8, 14, 7 , 0.7810

If a number is a non-perfect square, the square root is always an approximate value. If the number is figured out on a calculator, it will have a decimal that does not end or repeat. Since we will round off our answer it is considered an approximation.
Example: The square root of 7.5 is 2.738612788 on a calculator. We would round this off to 2.74

Pythagorean Theorem

Used for right angled triangles. The squared length of the hypotenuse is equal to the sum of the squared length of the other two sides. "c" is always the hypotenuse.

Surface Area

The surface area is the total area of the surface of the object.

In order to find the surface area of a composite object (two or more forms together to make one object), you must determine the surface area of each object, then subtract the area where the objects overlap.